Human beings act in a different way from【C1】______of animals just because they can speak while animals cannot.【C2】______the clev

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问题     Human beings act in a different way from【C1】______of animals just because they can speak while animals cannot.【C2】______the cleverest animals cannot do things which to us seem very【C3】______and which small children,【C4】______they learn to talk,would be able to do.
    A German scientist, who【C5】______experiments for many years with big apes, found that his apes could【C6】______his sticks as tools to pull down bananas which they could not【C7】______But they only used the stick to get a banana when both the banana and the stick were【C8】______view at the same time. If the banana was in front of them and the stick was behind them, they could not use the stick.
    They could not【C9】______the banana【C10】______enough in mind to look around and then pick up the stick and use it.
【C5】

选项 A、carried
B、dealt
C、developed
D、performed

答案D

解析
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